Composite pile with h-beam



Ail s, 1939. M, M, UPSON 2,168,459

I COMPOSiTE PILEv WITH H-BEAH Filed May 21, 1957 2 Sheets-Sheet 1=EIII|I k K I 1 o D b 4 r r r. P; A 0 v, A I 4 Q 4 In I INVENTORATTORNEY I.

2 Sheets-Sheet 2 M. M. UPSON COMPOSITE FILE WITH H-BEAM Filed May 21,1937 FIGS.

INVENTOR BY W m! ATTORNEYS Patented Aug. 8, 1939 UNITED STATES PATENT'OFFlCE 2,168,459 COMPOSITE PILE WITH H-BEAM Application May 21, 1937,Serial No. 143,911

2 Claims.

This invention pertains to composite piles, and an object of theinvention is to disclose a practical composite pile having an H-beam (orother structural shape) lower section and a concrete upper section.

An advantage of an H-beam pile is the fact that, due to itscomparatively slight displacement it has little surface friction and maytherefore, under some conditions, be driven to rock through hardpan,gravel and sand. But that same characteristic of the H-beam is adisadvantage because, after driving, practically all the load comes onthe point, for the reason that the surface friction is not a materialload-carrying factor.

Another disadvantage of the H-beam pile is the probability of corrosionabove the permanent water line.

An object of the present invention is to make use of good features ofthe H-beam and to largely avoid its disadvantagesby forming a compositepile with an H-beam lower section and a concrete upper section. Theconcrete upper section makes the upper part of the structure permanentby avoiding corrosion. The concrete, because of its large displacementand surface area, has a very material carrying capacity, thus relievingthe point of the H-beam of enough of its load to justify the use of theH-beam point under certain engineering and economic conditions.

Another object of the invention is to provide means for transferring theload from the concrete upper section to the steel lower section.

Further and other objects and advantages will be apparent from thespecification and claims, and from the accompanying drawings which i1-lustrate what is now considered a preferred embodiment of the invention.

Fig. 1 shows a finished pile after driving.

Fig. 2 is an enlarged detail during driving.

Fig. 3 isan enlarged detail of a finished pile.

Fig. 4 is a cross-section on line 4-4 of Fig. 3.

Figs. 5 and 6 show modified details.

Fig. 1 illustrates a finished pile after driving. H2 is the H-beamresting on rock 12, while l3, l4 and I5 is the concrete upper sectionprojecting above ground level 16. The concrete section as illustrated isof the stepped tapered construction disclosed in my Patent No.1,836,140, December 15, 1931.

If driver headroom permits, the pile could be driven in one operation,but if headroom is lacking the steel section may be driven first, andthen followed down with the concrete section, in well-known manner. Fig.2 shows the lower end of the drive core, the upper end of the H- beam,the plow ring and lower shell section ready for driving. 18 is the drivecore, having a recess in its lower end to accommodate and guide theupper end of beam 10. The shell section 20 is carried down by the usualplow ring 22 attached to a plate 24 provided with an H- slot to fitaround the beam for excluding dirt and water (Figs. 2 and 3). In orderto enter the shell over the beam the shell and plate 24 can be rotatedto proper position before lowering the drive core into the shell.

After removal of the drive core and before pouring the concrete, a cageof reinforcement, which may be in the form of spiral wire 25 andstraight bars 26 may be placed inside the shell around the upper end ofthe beam.

If it be desired to shorten the embedded portion of the upper end of theH-beam, various devices may be used for providing sufficient bondingsurface in that shortened portion. For instance, vertical plates may bewelded to the web of the beam, as indicated by dotted lines 28 (Fig. 5).Another device which permits shortening of the embedded portion is toweld a horizontal shelf-like plate 39 (Fig. 5) to web and flanges oneach side of the beam at the bottom of the concrete. A welded anglebrace 32 may be placed under each shelf 36, if desired.

Fig. 6 shows a modification in which the beam does not project into theconcrete at all. A plate 34 is welded horizontally on the top of thebeam, or is held there by bolted brackets such as 36. As illustrated, acorrugated screw threaded collar 38 is welded to the rim of plate 34.The lowest shell section 21! is screwed into collar 38. After driving,the pile is filled with concrete 42 to form the finished structure.

It is to be understood that the invention is not limited to the specificembodiment herein illustrated and described, but may be used in otherways Without departure from its spirit as defined by the followingclaims.

I claim- 1. A composite pile comprising in combination an H-beam lowersection having a horizontal plate on its upper end and a concrete uppersection attached to the 'H-beam through the instrumentality of saidplate.

2. The invention set forthin claim 1 in which said attaching meanscomprises a corrugated screw-threaded collar welded to said plate andthreaded to the bottom of the lowermost shell of the concrete uppersection.

MAXWELL M. UPSON.

